Elektrokemija antrakinona v organskih topilih

Benedik, Matej (author), Genorio, Boštjan (mentor)

Li-ionski akumulatorji, ki trenutno prevladujejo na trgu akumulatorskih sistemov, se počasi približujejo svoji teoretični kapaciteti. V zadnjem času smo zato priča intenzivnem raziskovanju novih tipov akumulatorjev. Med različnimi tipi akumulatorjev vse popularnejši postajajo organski katodni materiali, predvsem zaradi njihove vsestranskosti in dostopnosti. Zanimiva skupina elektroaktivnih organskih molekul so kinoni. V organskih topilih se kinoni ponavadi reverzibilno reducirajo v dveh eno-elektronskih korakih ali v enem dvoelektronskem koraku do dianiona. Mednje spada tudi molekula antrakinon (AQ). V magistrski nalogi sem raziskoval mehanizem redukcije antrakinona v dveh različnih sistemih, v klasični elektrokemijski celici in v akumulatorskem sistemu. Postavil ter opisal sem sistem za preučevanje elektrokemije v suhi komori. V klasični elektrokemijski celici sem izvajal eksperimente s šestimi različnimi solmi (LiTFSI, NaTFSI, KTFSI, TBATFSI, Mg(TFSI)2, Ca(TFSI)2). Ugotavljal sem vpliv kationa na mehanizem reakcije. Rezultati so pokazali, da ima kation velik vpliv na reakcijo, predvsem na stabilizacijo anionskega radikala. TBA+ kation je med enovalentnimi kationi izkazal najboljše rezultate. Pri dvovaletnih kationih je bila reakcija močno ireverzibilna. Elektrokemijo smo nato raziskovali v akumulatorskem sistemu, v 2-elektrodnem in 3-elektrodnem sistemu. Raziskovali smo vpliv Li+, Na+ in K+ kationov na elektrokemijo akumulatroskih sistemov. Iz rezultatov lahko sklepamo, da so opaženi platoji posledica katodnih reakcij. Ko primerjamo rezultate iz klasične celice in iz akumulatorskega sistema, vidimo, da kation ne vpliva na prvi vrh oziroma plato, ampak šele na naslednji vrh oziroma plato. Rezultati so pokazali, da je elektrokemija AQ zanimiva za nadaljnje študije.

• Language: Slovenian
• Keywords: antrakinon, CV, elektrokemija, organska topila
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2020
• PID: 20.500.12556/RUL-117564
• COBISS.SI-ID: 23871235
• Publication date in RUL: 16.07.2020

Secondary language

• Language: English
• Title: Electrochemistry of anthraquinone in organic solvents

Abstract

Li-ion batteries are slowly reaching their theoretical capacity. Researchers are therefore researching new types of batteries. For this reason research into organic cathode materials is gaining popularity in recent years because of their versatility and availability. Attractive group of organic materials are quinones. In organic solvents they are usually reduced in two one-electron steps or in one twoelectron step to dianion. Among this group is a molecule anthraquinone (AQ). In this thesis we have been researching the mechanism of reduction of anthraquinone in two different systems, in a beaker cell system and in a battery system. We have built a glovebox system for studying electrochemistry. In the beaker cell we have made several experiments with six different salts (LiTFSI, NaTFSI, KTFSI, TBATFSI, Mg(TFSI)2, Ca(TFSI)2). We have been researching the influence of a cation on the mechanism of the reaction. The results have shown that a cation has a great influence on a reaction, especially on the stabilization of anion radical. For the monovalent cations, TBA+ cation gave us best results. Reactions with divalent cations was highly irreversible. Next we studied electrochemistry in a battery system, in a 2-electrode and 3-electrode system. We researched Li+, Na+ in K+ cations. From the results of the battery system, we can conclude that cathode is the sole reason for visible plateaus. When comparing results from a battery system and a beaker cell system, we discovered that cation does not influence the first peak/plateau, but the second one. Results have shown that electrochemistry of AQ has potential for further studies.

• Keywords: anthraquinone, CV, electrochemistry, organic solvents